Triangulation means combining different methods of data collection to reach more reliable conclusions. This might mean for example putting together quantitative evidence from a questionnaire with more qualitative results from interviews. It can also mean taking evidence from similar data types, for example interviews, but considering the ways in which evidence from different people can be combined to answer a question. When different data sources lead you to the same conclusion you have strengthened that conclusion through triangulation.
This Geographical Skills explores triangulation in sampling and fieldwork design and shows how it can be used in an A-level geography project.
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